XYZ Racing Circuit Master Coilovers — BMW 4 SERIES G23 (2WD/4WD) 4/6CYL 2020-2026

The G23 4 Series convertible carries extra structure over the coupe to compensate for the folding roof, and that mass sits high and rearward when the top is stowed. Circuit Master coilovers are built for sustained lap-time work rather than the odd trackday, which matters on a chassis that has to fight body flex under load as much as it fights weight transfer.

Whether the car left the factory as 2WD rear-drive or xDrive, the brief is the same: control a heavier body through repeated corners without the ride degrading as oil temperatures climb. Circuit Master’s damper architecture is built to hold its character lap after lap of continuous circuit use, not just for a single hot lap.

What this coilover does for your 2020-2026 Bmw 4 Series G23 (2wd/4wd) 4/6cyl

Independent adjustment of ride height, compression and rebound lets you set the G23 down enough to lower its centre of gravity while keeping enough stroke to absorb kerbs at a UK circuit like Anglesey or Cadwell. On the 4WD xDrive cars, front-end support becomes the priority – get the front spring rate and damping right and you check the nose-heavy push that comes from a driven front axle carrying turbo four- or six-cylinder weight. On 2WD variants the focus shifts to rear traction under power, where correctly matched compression damping keeps the rear axle loaded through corner exit rather than skating over bumps mid-corner. Stiffer, track-appropriate spring rates also cut the pitch and dive this soft-top platform is prone to under hard braking into a chicane, so the front end stays planted and predictable when you’re trail-braking to the apex.

About the Circuit Master coilover

Circuit Master sits at the top of XYZ Racing’s range, positioned for circuit and competitive use – the kind of spec seen on cars run in Racing Spec, Drift Spec and Tarmac Rally configurations. It’s the damper XYZ Racing’s own teams run and validate internationally, and that testing feeds into a genuinely extensive adjustment range: 9,720 possible damping combinations across the unit, controlled through 3 separate adjustment knobs rather than a single dial. That range lets you split high- and low-speed damping behaviour independently instead of compromising on one setting for both. The knobs work through small-bore oil passages, and on rough sections of track that can produce a faint noise as oil moves through the restriction – this is a normal characteristic of the design, not a fault, and it’s specifically engineered around circuit-surface use rather than everyday road bumps.

Fitment for the Bmw 4 Series G23 (2WD/4WD) 4/6CYL (2020-2026)

Built for the G23-generation 4 Series covering both 4-cylinder and 6-cylinder engine variants, 2WD and xDrive 4WD drivetrains, across the 2020-2026 model years. Confirm your car matches chassis code BM121 before ordering, as the G23 convertible’s mounting points and reinforced structure differ from the G22 coupe and G26 Gran Coupe.

What buyers also search for

• Bmw 4 Series G23 coilover kit for track and fast road use
• Bmw G23 4/6 cylinder suspension upgrade for both 2WD and xDrive 4WD
• Circuit Master damping adjustment for repeat lap sessions in a 4 Series convertible
• Bmw 4 Series BM121 lowering kit with independent height and damping control
• G23 xDrive front-end support and 2WD rear traction improvements

Circuit Master is built around the specific demands of running the G23 hard on a UK circuit – configure yours below to match your 2WD or xDrive setup.